Charted! - Crushing

To unlock "Crushing" mode, simply beat the game on any difficulty (That includes Very Easy.) After beating the game, beat it on Crushing.

Crushing mode is difficult and there will be some parts that will leave you frustrated. Some basic tips for Crushing mode: Stay in cover at all times and take your time while fighting enemies. Roll (Circle) to dodge bullets and aim for headshots as it will save you a ton of ammo. The AIs will shoot and kill enemies also, so it's a good idea to hang back in cover while your friends do the rest. Try to take out enemies by perfoming stealth attacks to save yourself some time, trouble, and ammunition. Make sure to frequently grab the RPG7, TAU Sniper, and any other power weapon you can find when you get to Chapter 21. Power weapons will prove valuable as the enemies get much more difficult to defeat.